add global environment variable feature

packages/node_modules/@node-red/runtime/lib/flows/index.js

@@ -777,6 +777,16 @@ const flowAPI = {
 }
 
 
+function getGlobalConfig() {
+    let gconf = null;
+    eachNode((n) => {
+        if (n.type === "global-config") {
+            gconf = n;
+        }
+    });
+    return gconf;
+}
+
 module.exports = {
     init: init,
 
@@ -790,6 +800,9 @@ module.exports = {
     get:getNode,
     eachNode: eachNode,
 
+
+    getGlobalConfig: getGlobalConfig,
+    
     /**
      * Gets the current flow configuration
      */

packages/node_modules/@node-red/runtime/lib/flows/util.js

@@ -18,7 +18,9 @@ var redUtil = require("@node-red/util").util;
 var Log = require("@node-red/util").log;
 var subflowInstanceRE = /^subflow:(.+)$/;
 var typeRegistry = require("@node-red/registry");
+const credentials = require("../nodes/credentials");
 
+let _runtime = null;
 
 var envVarExcludes = {};
 
@@ -263,15 +265,55 @@ function parseConfig(config) {
    return flow;
 }
 
+function getGlobalEnv(name) {
+    const nodes = _runtime.nodes;
+    if (!nodes) {
+        return null;
+    }
+    const gconf = nodes.getGlobalConfig();
+    const env = gconf ? gconf.env : null;
+
+    if (env) {
+        const cred = (gconf ? credentials.get(gconf.id) : null) || {
+            map: {}
+        };
+        const map = cred.map;
+
+        for (let i = 0; i < env.length; i++) {
+            const item = env[i];
+            if (item.name === name) {
+                if (item.type === "cred") {
+                    return {
+                        name: name,
+                        value: map[name],
+                        type: "cred"
+                    };
+                }
+                return item;
+            }
+        }
+    }
+    return null;
+}
+
 module.exports = {
     init: function(runtime) {
+        _runtime = runtime;
         envVarExcludes = {};
         if (runtime.settings.hasOwnProperty('envVarExcludes') && Array.isArray(runtime.settings.envVarExcludes)) {
             runtime.settings.envVarExcludes.forEach(v => envVarExcludes[v] = true);
         }
     },
     getEnvVar: function(k) {
-        return !envVarExcludes[k]?process.env[k]:undefined
+        if (!envVarExcludes[k]) {
+            const item = getGlobalEnv(k);
+            if (item) {
+                const val = redUtil.evaluateNodeProperty(item.value, item.type, null, null, null);
+                return val;
+            }
+            return process.env[k];
+        }
+        return undefined;
     },
     diffNodes: diffNodes,
     mapEnvVarProperties: mapEnvVarProperties,

packages/node_modules/@node-red/runtime/lib/nodes/credentials.js

@@ -383,6 +383,11 @@ var api = module.exports = {
                         }
                     }
                 }
+            } else if (nodeType === "global-config") {
+                if (JSON.stringify(savedCredentials.map) !== JSON.stringify(newCreds.map)) {
+                    savedCredentials.map = newCreds.map;
+                    dirty = true;
+                }
             } else {
                 var dashedType = nodeType.replace(/\s+/g, '-');
                 var definition = credentialsDef[dashedType];

packages/node_modules/@node-red/runtime/lib/nodes/index.js

@@ -205,6 +205,7 @@ module.exports = {
     getNode: flows.get,
     eachNode: flows.eachNode,
     getContext: context.get,
+    getGlobalConfig: flows.getGlobalConfig,
 
     clearContext: context.clear,